Everyone has a different understanding of home. How can we decorate the perfect home with limited funds? In home decoration, many owners are concerned about the cost of decoration. Therefore, before renovation, we must plan well, and only good planning can reduce the cost.
With the arrival of the peak of marriage, the furniture market is heating up again, a variety of novel furniture is dazzling, but many people buy furniture that is not satisfactory, some furniture looks good, but its materials are filled with harmful substances, Other furniture is very good to buy, but it is not long after buying back, how should we buy furniture? What kind of furniture can't be bought?
The first is not to buy if the price is relatively low and the bargain is particularly easy. Let ’s not talk about it first. It ’s so easy to bargain. If you think about it for sure, there is a problem. Some furniture is particularly cheap. Sometimes, bargaining can even cost thousands of dollars. The materials are often made of gold and jade. Consumers must be careful about these seemingly cheap ones.
The second is not to buy furniture with a strong irritating smell. Some furniture such as cabinets, etc., when you pull open the drawer and open the door when you buy it, the smell is irritating, which shows that the formaldehyde content of this furniture is seriously exceeding the standard. This kind of furniture is very harmful to the body and is generally not recommended for purchase. If you purchase this type of furniture because of conditions, it is best to leave it for a period of time before using it.
The third type should be noted that furniture made of wood-based panels should not be bought if they have not been fully edge-sealed. All furniture parts made of wood-based panels have very strict restrictions on edge banding, especially chipboard for furniture should require all edge banding, which can limit the release of harmful substances in wood-based panels, but many manufacturers are currently in order to save materials. Only partial edge banding, such furniture is best not to buy.
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With the continuous development of drilling production, the use conditions of drilling rigs have become more and more diversified, and various types of drilling rigs have appeared accordingly. Factors affecting the type and composition of drilling rigs include drilling method, drilling depth, borehole size and drilling tool size, and drilling area conditions (such as electricity or fuel, transportation, and meteorological conditions).
1. According to drilling method
(1) Impact drilling rigs, such as wire rope impact drilling rigs (drilling rigs), vibration drilling rigs, etc.
(2) Rotary drilling rigs, such as those used in rotary drilling.
(3) Downhole power drilling tools, such as rotary drilling tools, turbo drilling tools, screw drilling tools, electric drilling tools, etc.
2. Divided by drilling depth
(1) Ultra-deep well drilling rig. It adopts a drilling rig with a diameter of 114 mm drill pipe, a nominal drilling depth range of more than 7000 meters, and a maximum hook load of more than 4,500 kN.
(2) Deep well drilling rig. The drill rod is 114 mm in diameter, the nominal drilling depth is 4000-7000 meters or more, and the maximum hook load is 2250-4500 kN or more.
(3) Drilling rigs for medium and deep wells. It adopts a drilling rig with a diameter of 114 mm drill pipe, a nominal drilling depth range of 1500-4000 meters or more, and a maximum hook load of 900-2250 kN or more.
Three, according to power equipment
(1) Diesel Engine-driven drilling rigs, which use diesel engines as power through mechanical transmission or hydraulic transmission.
(2) AC driven drilling rig, suitable for use in oil fields with industrial power grids.
(3) The drilling rig is driven by direct current, and the working unit is driven by a direct current motor.
Fourth, according to the driving mode
(1) Drive alone. Each working machine is driven by generators of different sizes, which are mostly used for electric drive. The transmission is simple and easy to install, but the power utilization rate is low and the total equipment mass is large.
(2) Unified drive. The three working units of drawworks, drilling Pump and turntable are driven by the same power unit. Most drilling rigs use this scheme. The unified drive can also include only one drilling pump, and the other drilling pump is driven separately. The unified drive drilling rig has high power utilization and can be adjusted mutually when the engine fails, but the transmission is complicated, installation and adjustment are troublesome, and the transmission efficiency is low.
(3) Group drive. The combination of power is between individual drive and unified drive. There are two options for three working machines. The power utilization rate of this kind of drilling rig is higher than that of a single drive, and the transmission ratio is simple to drive in a unified manner. Two sets of working machines can also be installed on different heights and scattered sites.
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